<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * Loader Class
 *
 * Loads views and files
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @author		ExpressionEngine Dev Team
 * @category	Loader
 * @link		http://codeigniter.com/user_guide/libraries/loader.html
 */
class CI_Loader {

  // All these are set automatically. Don't mess with them.
  /**
   * Nesting level of the output buffering mechanism
   *
   * @var int
   * @access protected
   */
  protected $_ci_ob_level;
  /**
   * List of paths to load views from
   *
   * @var array
   * @access protected
   */
  protected $_ci_view_paths		= array();
  /**
   * List of paths to load libraries from
   *
   * @var array
   * @access protected
   */
  protected $_ci_library_paths	= array();
  /**
   * List of paths to load models from
   *
   * @var array
   * @access protected
   */
  protected $_ci_model_paths		= array();
  /**
   * List of paths to load helpers from
   *
   * @var array
   * @access protected
   */
  protected $_ci_helper_paths		= array();
  /**
   * List of loaded base classes
   * Set by the controller class
   *
   * @var array
   * @access protected
   */
  protected $_base_classes		= array(); // Set by the controller class
  /**
   * List of cached variables
   *
   * @var array
   * @access protected
   */
  protected $_ci_cached_vars		= array();
  /**
   * List of loaded classes
   *
   * @var array
   * @access protected
   */
  protected $_ci_classes			= array();
  /**
   * List of loaded files
   *
   * @var array
   * @access protected
   */
  protected $_ci_loaded_files		= array();
  /**
   * List of loaded models
   *
   * @var array
   * @access protected
   */
  protected $_ci_models			= array();
  /**
   * List of loaded helpers
   *
   * @var array
   * @access protected
   */
  protected $_ci_helpers			= array();
  /**
   * List of class name mappings
   *
   * @var array
   * @access protected
   */
  protected $_ci_varmap			= array('unit_test' => 'unit',
    'user_agent' => 'agent');

  /**
   * Constructor
   *
   * Sets the path to the view files and gets the initial output buffering level
   */
  public function __construct() {
    $this->_ci_ob_level  = ob_get_level();
    $this->_ci_library_paths = array(APPPATH, BASEPATH);
    $this->_ci_helper_paths = array(APPPATH, BASEPATH);
    $this->_ci_model_paths = array(APPPATH);
    $this->_ci_view_paths = array(APPPATH.'views/'	=> TRUE);

    log_message('debug', "Loader Class Initialized");
  }

  // --------------------------------------------------------------------

  /**
   * Initialize the Loader
   *
   * This method is called once in CI_Controller.
   *
   * @param 	array
   * @return 	object
   */
  public function initialize() {
    $this->_ci_classes = array();
    $this->_ci_loaded_files = array();
    $this->_ci_models = array();
    $this->_base_classes =& is_loaded();

    $this->_ci_autoloader();

    return $this;
  }

  // --------------------------------------------------------------------

  /**
   * Is Loaded
   *
   * A utility function to test if a class is in the self::$_ci_classes array.
   * This function returns the object name if the class tested for is loaded,
   * and returns FALSE if it isn't.
   *
   * It is mainly used in the form_helper -> _get_validation_object()
   *
   * @param 	string	class being checked for
   * @return 	mixed	class object name on the CI SuperObject or FALSE
   */
  public function is_loaded($class) {
    if (isset($this->_ci_classes[$class])) {
      return $this->_ci_classes[$class];
    }

    return FALSE;
  }

  // --------------------------------------------------------------------

  /**
   * Class Loader
   *
   * This function lets users load and instantiate classes.
   * It is designed to be called from a user's app controllers.
   *
   * @param	string	the name of the class
   * @param	mixed	the optional parameters
   * @param	string	an optional object name
   * @return	void
   */
  public function library($library = '', $params = NULL, $object_name = NULL) {
    if (is_array($library)) {
      foreach ($library as $class) {
        $this->library($class, $params);
      }

      return;
    }

    if ($library == '' OR isset($this->_base_classes[$library])) {
      return FALSE;
    }

    if ( ! is_null($params) && ! is_array($params)) {
      $params = NULL;
    }

    $this->_ci_load_class($library, $params, $object_name);
  }

  // --------------------------------------------------------------------

  /**
   * Model Loader
   *
   * This function lets users load and instantiate models.
   *
   * @param	string	the name of the class
   * @param	string	name for the model
   * @param	bool	database connection
   * @return	void
   */
  public function model($model, $name = '', $db_conn = FALSE) {
    if (is_array($model)) {
      foreach ($model as $babe) {
        $this->model($babe);
      }
      return;
    }

    if ($model == '') {
      return;
    }

    $path = '';

    // Is the model in a sub-folder? If so, parse out the filename and path.
    if (($last_slash = strrpos($model, '/')) !== FALSE) {
      // The path is in front of the last slash
      $path = substr($model, 0, $last_slash + 1);

      // And the model name behind it
      $model = substr($model, $last_slash + 1);
    }

    if ($name == '') {
      $name = $model;
    }

    if (in_array($name, $this->_ci_models, TRUE)) {
      return;
    }

    $CI =& get_instance();
    if (isset($CI->$name)) {
      show_error('The model name you are loading is the name of a resource that is already being used: '.$name);
    }

    $model = strtolower($model);

    foreach ($this->_ci_model_paths as $mod_path) {
      if ( ! file_exists($mod_path.'models/'.$path.$model.'.php')) {
        continue;
      }

      if ($db_conn !== FALSE AND ! class_exists('CI_DB')) {
        if ($db_conn === TRUE) {
          $db_conn = '';
        }

        $CI->load->database($db_conn, FALSE, TRUE);
      }

      if ( ! class_exists('CI_Model')) {
        load_class('Model', 'core');
      }

      require_once($mod_path.'models/'.$path.$model.'.php');

      $model = ucfirst($model);

      $CI->$name = new $model();

      $this->_ci_models[] = $name;
      return;
    }

    // couldn't find the model
    show_error('Unable to locate the model you have specified: '.$model);
  }

  // --------------------------------------------------------------------

  /**
   * Database Loader
   *
   * @param	string	the DB credentials
   * @param	bool	whether to return the DB object
   * @param	bool	whether to enable active record (this allows us to override the config setting)
   * @return	object
   */
  public function database($params = '', $return = FALSE, $active_record = NULL) {
    // Grab the super object
    $CI =& get_instance();

    // Do we even need to load the database class?
    if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($CI->db) AND is_object($CI->db)) {
      return FALSE;
    }

    require_once(BASEPATH.'database/DB.php');

    if ($return === TRUE) {
      return DB($params, $active_record);
    }

    // Initialize the db variable.  Needed to prevent
    // reference errors with some configurations
    $CI->db = '';

    // Load the DB class
    $CI->db =& DB($params, $active_record);
  }

  // --------------------------------------------------------------------

  /**
   * Load the Utilities Class
   *
   * @return	string
   */
  public function dbutil() {
    if ( ! class_exists('CI_DB')) {
      $this->database();
    }

    $CI =& get_instance();

    // for backwards compatibility, load dbforge so we can extend dbutils off it
    // this use is deprecated and strongly discouraged
    $CI->load->dbforge();

    require_once(BASEPATH.'database/DB_utility.php');
    require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_utility.php');
    $class = 'CI_DB_'.$CI->db->dbdriver.'_utility';

    $CI->dbutil = new $class();
  }

  // --------------------------------------------------------------------

  /**
   * Load the Database Forge Class
   *
   * @return	string
   */
  public function dbforge() {
    if ( ! class_exists('CI_DB')) {
      $this->database();
    }

    $CI =& get_instance();

    require_once(BASEPATH.'database/DB_forge.php');
    require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_forge.php');
    $class = 'CI_DB_'.$CI->db->dbdriver.'_forge';

    $CI->dbforge = new $class();
  }

  // --------------------------------------------------------------------

  /**
   * Load View
   *
   * This function is used to load a "view" file.  It has three parameters:
   *
   * 1. The name of the "view" file to be included.
   * 2. An associative array of data to be extracted for use in the view.
   * 3. TRUE/FALSE - whether to return the data or load it.  In
   * some cases it's advantageous to be able to return data so that
   * a developer can process it in some way.
   *
   * @param	string
   * @param	array
   * @param	bool
   * @return	void
   */
  public function view($view, $vars = array(), $return = FALSE) {
    return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return));
  }

  // --------------------------------------------------------------------

  /**
   * Load File
   *
   * This is a generic file loader
   *
   * @param	string
   * @param	bool
   * @return	string
   */
  public function file($path, $return = FALSE) {
    return $this->_ci_load(array('_ci_path' => $path, '_ci_return' => $return));
  }

  // --------------------------------------------------------------------

  /**
   * Set Variables
   *
   * Once variables are set they become available within
   * the controller class and its "view" files.
   *
   * @param	array
   * @param 	string
   * @return	void
   */
  public function vars($vars = array(), $val = '') {
    if ($val != '' AND is_string($vars)) {
      $vars = array($vars => $val);
    }

    $vars = $this->_ci_object_to_array($vars);

    if (is_array($vars) AND count($vars) > 0) {
      foreach ($vars as $key => $val) {
        $this->_ci_cached_vars[$key] = $val;
      }
    }
  }

  // --------------------------------------------------------------------

  /**
   * Get Variable
   *
   * Check if a variable is set and retrieve it.
   *
   * @param	array
   * @return	void
   */
  public function get_var($key) {
    return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;
  }

  // --------------------------------------------------------------------

  /**
   * Load Helper
   *
   * This function loads the specified helper file.
   *
   * @param	mixed
   * @return	void
   */
  public function helper($helpers = array()) {
    foreach ($this->_ci_prep_filename($helpers, '_helper') as $helper) {
      if (isset($this->_ci_helpers[$helper])) {
        continue;
      }

      $ext_helper = APPPATH.'helpers/'.config_item('subclass_prefix').$helper.'.php';

      // Is this a helper extension request?
      if (file_exists($ext_helper)) {
        $base_helper = BASEPATH.'helpers/'.$helper.'.php';

        if ( ! file_exists($base_helper)) {
          show_error('Unable to load the requested file: helpers/'.$helper.'.php');
        }

        include_once($ext_helper);
        include_once($base_helper);

        $this->_ci_helpers[$helper] = TRUE;
        log_message('debug', 'Helper loaded: '.$helper);
        continue;
      }

      // Try to load the helper
      foreach ($this->_ci_helper_paths as $path) {
        if (file_exists($path.'helpers/'.$helper.'.php')) {
          include_once($path.'helpers/'.$helper.'.php');

          $this->_ci_helpers[$helper] = TRUE;
          log_message('debug', 'Helper loaded: '.$helper);
          break;
        }
      }

      // unable to load the helper
      if ( ! isset($this->_ci_helpers[$helper])) {
        show_error('Unable to load the requested file: helpers/'.$helper.'.php');
      }
    }
  }

  // --------------------------------------------------------------------

  /**
   * Load Helpers
   *
   * This is simply an alias to the above function in case the
   * user has written the plural form of this function.
   *
   * @param	array
   * @return	void
   */
  public function helpers($helpers = array()) {
    $this->helper($helpers);
  }

  // --------------------------------------------------------------------

  /**
   * Loads a language file
   *
   * @param	array
   * @param	string
   * @return	void
   */
  public function language($file = array(), $lang = '') {
    $CI =& get_instance();

    if ( ! is_array($file)) {
      $file = array($file);
    }

    foreach ($file as $langfile) {
      $CI->lang->load($langfile, $lang);
    }
  }

  // --------------------------------------------------------------------

  /**
   * Loads a config file
   *
   * @param	string
   * @param	bool
   * @param 	bool
   * @return	void
   */
  public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE) {
    $CI =& get_instance();
    $CI->config->load($file, $use_sections, $fail_gracefully);
  }

  // --------------------------------------------------------------------

  /**
   * Driver
   *
   * Loads a driver library
   *
   * @param	string	the name of the class
   * @param	mixed	the optional parameters
   * @param	string	an optional object name
   * @return	void
   */
  public function driver($library = '', $params = NULL, $object_name = NULL) {
    if ( ! class_exists('CI_Driver_Library')) {
      // we aren't instantiating an object here, that'll be done by the Library itself
      require BASEPATH.'libraries/Driver.php';
    }

    if ($library == '') {
      return FALSE;
    }

    // We can save the loader some time since Drivers will *always* be in a subfolder,
    // and typically identically named to the library
    if ( ! strpos($library, '/')) {
      $library = ucfirst($library).'/'.$library;
    }

    return $this->library($library, $params, $object_name);
  }

  // --------------------------------------------------------------------

  /**
   * Add Package Path
   *
   * Prepends a parent path to the library, model, helper, and config path arrays
   *
   * @param	string
   * @param 	boolean
   * @return	void
   */
  public function add_package_path($path, $view_cascade=TRUE) {
    $path = rtrim($path, '/').'/';

    array_unshift($this->_ci_library_paths, $path);
    array_unshift($this->_ci_model_paths, $path);
    array_unshift($this->_ci_helper_paths, $path);

    $this->_ci_view_paths = array($path.'views/' => $view_cascade) + $this->_ci_view_paths;

    // Add config file path
    $config =& $this->_ci_get_component('config');
    array_unshift($config->_config_paths, $path);
  }

  // --------------------------------------------------------------------

  /**
   * Get Package Paths
   *
   * Return a list of all package paths, by default it will ignore BASEPATH.
   *
   * @param	string
   * @return	void
   */
  public function get_package_paths($include_base = FALSE) {
    return $include_base === TRUE ? $this->_ci_library_paths : $this->_ci_model_paths;
  }

  // --------------------------------------------------------------------

  /**
   * Remove Package Path
   *
   * Remove a path from the library, model, and helper path arrays if it exists
   * If no path is provided, the most recently added path is removed.
   *
   * @param	type
   * @param 	bool
   * @return	type
   */
  public function remove_package_path($path = '', $remove_config_path = TRUE) {
    $config =& $this->_ci_get_component('config');

    if ($path == '') {
      $void = array_shift($this->_ci_library_paths);
      $void = array_shift($this->_ci_model_paths);
      $void = array_shift($this->_ci_helper_paths);
      $void = array_shift($this->_ci_view_paths);
      $void = array_shift($config->_config_paths);
    }
    else {
      $path = rtrim($path, '/').'/';
      foreach (array('_ci_library_paths', '_ci_model_paths', '_ci_helper_paths') as $var) {
        if (($key = array_search($path, $this->{$var})) !== FALSE) {
          unset($this->{$var}[$key]);
        }
      }

      if (isset($this->_ci_view_paths[$path.'views/'])) {
        unset($this->_ci_view_paths[$path.'views/']);
      }

      if (($key = array_search($path, $config->_config_paths)) !== FALSE) {
        unset($config->_config_paths[$key]);
      }
    }

    // make sure the application default paths are still in the array
    $this->_ci_library_paths = array_unique(array_merge($this->_ci_library_paths, array(APPPATH, BASEPATH)));
    $this->_ci_helper_paths = array_unique(array_merge($this->_ci_helper_paths, array(APPPATH, BASEPATH)));
    $this->_ci_model_paths = array_unique(array_merge($this->_ci_model_paths, array(APPPATH)));
    $this->_ci_view_paths = array_merge($this->_ci_view_paths, array(APPPATH.'views/' => TRUE));
    $config->_config_paths = array_unique(array_merge($config->_config_paths, array(APPPATH)));
  }

  // --------------------------------------------------------------------

  /**
   * Loader
   *
   * This function is used to load views and files.
   * Variables are prefixed with _ci_ to avoid symbol collision with
   * variables made available to view files
   *
   * @param	array
   * @return	void
   */
  protected function _ci_load($_ci_data) {
    // Set the default data variables
    foreach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val) {
      $$_ci_val = ( ! isset($_ci_data[$_ci_val])) ? FALSE : $_ci_data[$_ci_val];
    }

    $file_exists = FALSE;

    // Set the path to the requested file
    if ($_ci_path != '') {
      $_ci_x = explode('/', $_ci_path);
      $_ci_file = end($_ci_x);
    }
    else {
      $_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);
      $_ci_file = ($_ci_ext == '') ? $_ci_view.'.php' : $_ci_view;

      foreach ($this->_ci_view_paths as $view_file => $cascade) {
        if (file_exists($view_file.$_ci_file)) {
          $_ci_path = $view_file.$_ci_file;
          $file_exists = TRUE;
          break;
        }

        if ( ! $cascade) {
          break;
        }
      }
    }

    if ( ! $file_exists && ! file_exists($_ci_path)) {
      show_error('Unable to load the requested file: '.$_ci_file);
    }

    // This allows anything loaded using $this->load (views, files, etc.)
    // to become accessible from within the Controller and Model functions.

    $_ci_CI =& get_instance();
    foreach (get_object_vars($_ci_CI) as $_ci_key => $_ci_var) {
      if ( ! isset($this->$_ci_key)) {
        $this->$_ci_key =& $_ci_CI->$_ci_key;
      }
    }

    /*
		 * Extract and cache variables
		 *
		 * You can either set variables using the dedicated $this->load_vars()
		 * function or via the second parameter of this function. We'll merge
		 * the two types and cache them so that views that are embedded within
		 * other views can have access to these variables.
    */
    if (is_array($_ci_vars)) {
      $this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);
    }
    extract($this->_ci_cached_vars);

    /*
		 * Buffer the output
		 *
		 * We buffer the output for two reasons:
		 * 1. Speed. You get a significant speed boost.
		 * 2. So that the final rendered template can be
		 * post-processed by the output class.  Why do we
		 * need post processing?  For one thing, in order to
		 * show the elapsed page load time.  Unless we
		 * can intercept the content right before it's sent to
		 * the browser and then stop the timer it won't be accurate.
    */
    ob_start();

    // If the PHP installation does not support short tags we'll
    // do a little string replacement, changing the short tags
    // to standard PHP echo statements.

    if ((bool) @ini_get('short_open_tag') === FALSE AND config_item('rewrite_short_tags') == TRUE) {
      echo eval('?>'.preg_replace("/;*\s*\?>/", "; ?>", str_replace('<?=', '<?php echo ', file_get_contents($_ci_path))));
    }
    else {
      include($_ci_path); // include() vs include_once() allows for multiple views with the same name
    }

    log_message('debug', 'File loaded: '.$_ci_path);

    // Return the file data if requested
    if ($_ci_return === TRUE) {
      $buffer = ob_get_contents();
      @ob_end_clean();
      return $buffer;
    }

    /*
		 * Flush the buffer... or buff the flusher?
		 *
		 * In order to permit views to be nested within
		 * other views, we need to flush the content back out whenever
		 * we are beyond the first level of output buffering so that
		 * it can be seen and included properly by the first included
		 * template and any subsequent ones. Oy!
		 *
    */
    if (ob_get_level() > $this->_ci_ob_level + 1) {
      ob_end_flush();
    }
    else {
      $_ci_CI->output->append_output(ob_get_contents());
      @ob_end_clean();
    }
  }

  // --------------------------------------------------------------------

  /**
   * Load class
   *
   * This function loads the requested class.
   *
   * @param	string	the item that is being loaded
   * @param	mixed	any additional parameters
   * @param	string	an optional object name
   * @return	void
   */
  protected function _ci_load_class($class, $params = NULL, $object_name = NULL) {
    // Get the class name, and while we're at it trim any slashes.
    // The directory path can be included as part of the class name,
    // but we don't want a leading slash
    $class = str_replace('.php', '', trim($class, '/'));

    // Was the path included with the class name?
    // We look for a slash to determine this
    $subdir = '';
    if (($last_slash = strrpos($class, '/')) !== FALSE) {
      // Extract the path
      $subdir = substr($class, 0, $last_slash + 1);

      // Get the filename from the path
      $class = substr($class, $last_slash + 1);
    }

    // We'll test for both lowercase and capitalized versions of the file name
    foreach (array(ucfirst($class), strtolower($class)) as $class) {
      $subclass = APPPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.'.php';

      // Is this a class extension request?
      if (file_exists($subclass)) {
        $baseclass = BASEPATH.'libraries/'.ucfirst($class).'.php';

        if ( ! file_exists($baseclass)) {
          log_message('error', "Unable to load the requested class: ".$class);
          show_error("Unable to load the requested class: ".$class);
        }

        // Safety:  Was the class already loaded by a previous call?
        if (in_array($subclass, $this->_ci_loaded_files)) {
          // Before we deem this to be a duplicate request, let's see
          // if a custom object name is being supplied.  If so, we'll
          // return a new instance of the object
          if ( ! is_null($object_name)) {
            $CI =& get_instance();
            if ( ! isset($CI->$object_name)) {
              return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
            }
          }

          $is_duplicate = TRUE;
          log_message('debug', $class." class already loaded. Second attempt ignored.");
          return;
        }

        include_once($baseclass);
        include_once($subclass);
        $this->_ci_loaded_files[] = $subclass;

        return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
      }

      // Lets search for the requested library file and load it.
      $is_duplicate = FALSE;
      foreach ($this->_ci_library_paths as $path) {
        $filepath = $path.'libraries/'.$subdir.$class.'.php';

        // Does the file exist?  No?  Bummer...
        if ( ! file_exists($filepath)) {
          continue;
        }

        // Safety:  Was the class already loaded by a previous call?
        if (in_array($filepath, $this->_ci_loaded_files)) {
          // Before we deem this to be a duplicate request, let's see
          // if a custom object name is being supplied.  If so, we'll
          // return a new instance of the object
          if ( ! is_null($object_name)) {
            $CI =& get_instance();
            if ( ! isset($CI->$object_name)) {
              return $this->_ci_init_class($class, '', $params, $object_name);
            }
          }

          $is_duplicate = TRUE;
          log_message('debug', $class." class already loaded. Second attempt ignored.");
          return;
        }

        include_once($filepath);
        $this->_ci_loaded_files[] = $filepath;
        return $this->_ci_init_class($class, '', $params, $object_name);
      }

    } // END FOREACH

    // One last attempt.  Maybe the library is in a subdirectory, but it wasn't specified?
    if ($subdir == '') {
      $path = strtolower($class).'/'.$class;
      return $this->_ci_load_class($path, $params);
    }

    // If we got this far we were unable to find the requested class.
    // We do not issue errors if the load call failed due to a duplicate request
    if ($is_duplicate == FALSE) {
      log_message('error', "Unable to load the requested class: ".$class);
      show_error("Unable to load the requested class: ".$class);
    }
  }

  // --------------------------------------------------------------------

  /**
   * Instantiates a class
   *
   * @param	string
   * @param	string
   * @param	bool
   * @param	string	an optional object name
   * @return	null
   */
  protected function _ci_init_class($class, $prefix = '', $config = FALSE, $object_name = NULL) {
    // Is there an associated config file for this class?  Note: these should always be lowercase
    if ($config === NULL) {
      // Fetch the config paths containing any package paths
      $config_component = $this->_ci_get_component('config');

      if (is_array($config_component->_config_paths)) {
        // Break on the first found file, thus package files
        // are not overridden by default paths
        foreach ($config_component->_config_paths as $path) {
          // We test for both uppercase and lowercase, for servers that
          // are case-sensitive with regard to file names. Check for environment
          // first, global next
          if (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php')) {
            include($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php');
            break;
          }
          elseif (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php')) {
            include($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php');
            break;
          }
          elseif (file_exists($path .'config/'.strtolower($class).'.php')) {
            include($path .'config/'.strtolower($class).'.php');
            break;
          }
          elseif (file_exists($path .'config/'.ucfirst(strtolower($class)).'.php')) {
            include($path .'config/'.ucfirst(strtolower($class)).'.php');
            break;
          }
        }
      }
    }

    if ($prefix == '') {
      if (class_exists('CI_'.$class)) {
        $name = 'CI_'.$class;
      }
      elseif (class_exists(config_item('subclass_prefix').$class)) {
        $name = config_item('subclass_prefix').$class;
      }
      else {
        $name = $class;
      }
    }
    else {
      $name = $prefix.$class;
    }

    // Is the class name valid?
    if ( ! class_exists($name)) {
      log_message('error', "Non-existent class: ".$name);
      show_error("Non-existent class: ".$class);
    }

    // Set the variable name we will assign the class to
    // Was a custom class name supplied?  If so we'll use it
    $class = strtolower($class);

    if (is_null($object_name)) {
      $classvar = ( ! isset($this->_ci_varmap[$class])) ? $class : $this->_ci_varmap[$class];
    }
    else {
      $classvar = $object_name;
    }

    // Save the class name and object name
    $this->_ci_classes[$class] = $classvar;

    // Instantiate the class
    $CI =& get_instance();
    if ($config !== NULL) {
      $CI->$classvar = new $name($config);
    }
    else {
      $CI->$classvar = new $name;
    }
  }

  // --------------------------------------------------------------------

  /**
   * Autoloader
   *
   * The config/autoload.php file contains an array that permits sub-systems,
   * libraries, and helpers to be loaded automatically.
   *
   * @param	array
   * @return	void
   */
  private function _ci_autoloader() {
    if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php')) {
      include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');
    }
    else {
      include(APPPATH.'config/autoload.php');
    }

    if ( ! isset($autoload)) {
      return FALSE;
    }

    // Autoload packages
    if (isset($autoload['packages'])) {
      foreach ($autoload['packages'] as $package_path) {
        $this->add_package_path($package_path);
      }
    }

    // Load any custom config file
    if (count($autoload['config']) > 0) {
      $CI =& get_instance();
      foreach ($autoload['config'] as $key => $val) {
        $CI->config->load($val);
      }
    }

    // Autoload helpers and languages
    foreach (array('helper', 'language') as $type) {
      if (isset($autoload[$type]) AND count($autoload[$type]) > 0) {
        $this->$type($autoload[$type]);
      }
    }

    // A little tweak to remain backward compatible
    // The $autoload['core'] item was deprecated
    if ( ! isset($autoload['libraries']) AND isset($autoload['core'])) {
      $autoload['libraries'] = $autoload['core'];
    }

    // Load libraries
    if (isset($autoload['libraries']) AND count($autoload['libraries']) > 0) {
      // Load the database driver.
      if (in_array('database', $autoload['libraries'])) {
        $this->database();
        $autoload['libraries'] = array_diff($autoload['libraries'], array('database'));
      }

      // Load all other libraries
      foreach ($autoload['libraries'] as $item) {
        $this->library($item);
      }
    }

    // Autoload models
    if (isset($autoload['model'])) {
      $this->model($autoload['model']);
    }
  }

  // --------------------------------------------------------------------

  /**
   * Object to Array
   *
   * Takes an object as input and converts the class variables to array key/vals
   *
   * @param	object
   * @return	array
   */
  protected function _ci_object_to_array($object) {
    return (is_object($object)) ? get_object_vars($object) : $object;
  }

  // --------------------------------------------------------------------

  /**
   * Get a reference to a specific library or model
   *
   * @param 	string
   * @return	bool
   */
  protected function &_ci_get_component($component) {
    $CI =& get_instance();
    return $CI->$component;
  }

  // --------------------------------------------------------------------

  /**
   * Prep filename
   *
   * This function preps the name of various items to make loading them more reliable.
   *
   * @param	mixed
   * @param 	string
   * @return	array
   */
  protected function _ci_prep_filename($filename, $extension) {
    if ( ! is_array($filename)) {
      return array(strtolower(str_replace('.php', '', str_replace($extension, '', $filename)).$extension));
    }
    else {
      foreach ($filename as $key => $val) {
        $filename[$key] = strtolower(str_replace('.php', '', str_replace($extension, '', $val)).$extension);
      }

      return $filename;
    }
  }
}

/* End of file Loader.php */
/* Location: ./system/core/Loader.php */